ap bio question. sequence of the events of translation (listed in question)?

Question

1. peptide bond formation takes place
2. aminoacyl tRNA joins the A site
3. methionine tRNA is released from the P site
4. methionine tRNA joins the P site.

QUESTION :which of the following represents a correct sequence of the events of translation listed above?
A. 1,2,3,4
B. 4,3,2,1
C. 4,2,1,3
D. 3,2,1,4
E. 2,3,4,1

Answer 1

B. 4,3,2,1



The ribosome is set up in such a way that there are 3 places for tRNA to act: The E site, the P site, and the A site, with E-P-A going from left to right. With the exception of the first amino acid that is translated (methionine), translation involves an aminoacyl tRNA joining at the A site. This aminoacyl tRNA complex helps bring about the correct pairing of a tRNA with its corresponding amino acid, so that the correct amino acid is added to the growing chain. Next the tRNA at the A site which now carries the proper amino acid, is transferred to the P site, where it joins. It transfers its amino acid to the growing chain while at the P site, and then is released from the P site, for the E site (E stands for exit).

This question specifically asks about the initiation of translation- this involves the beginning of the amino acid chain. Methionine is always the first amino acid in a chain, as it signals for translation to begin. It is unique when a new chain begins, because it goes immediately to the P site, without any aminoacyl-tRNA joining at the A site. SO- for this question, the order is 4,3,2,1.

Peptide bond formation is simply the formation of bonds between amino acids- so this takes place last in the process.

Answer 2

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Answer 3

B. 4,3,2,1